Interacciones Hiperfinas en Impurezas 181Ta en B-Gd2O3 Dopado por Implantación Iónica

M. RENTERÍA; L.A. ERRICO; A.G. BIBILONI; K. FREITAG

Anales AFA

Asociación Física Argentina

Lugar: Tandil; Año: 2001 vol. 12 p. 114 - 117

0327-358X

We report Perturbed-Angular-Correlation results of the electric-nuclear quadrupole interactions at 181Ta  impurities located at the three nonequivalent cationic sites of  the monoclinic structure of Gd2O3. The application of the electric-field-gradient empirical correlation found in binary oxides for Cd/Ta impurities allowed us to correlate these interactions with each site and to identify the single Gd site populated in 111In-implanted B-Gd2O3 experiments. The preferential site occupation of Cd and Ta in B-Gadolinia is discussed in terms of the coordination chemistry of the probe atoms. The temperature dependence of the observed hyperfine interactions is also discussed.